My friend Jo asked on GEOS mailing list for approachable explanation of spatial relations and Dale Lutz from Safe Software suggested something I’ve not came across myself before and what (in generalised form) I’d consider as a great idea for…a book really :-)

I would be a devoted reader of such a book! Meanwhile, as an author of the page, I can promise to finish it, hopefully, in a not very distant future. I wanted to make a bit clearer illustrations and add some text as well as the examples (for FME).
Dmitri, thanks!
Hey, thanks for the mention in ur post! Even if its to call me *dummy*! ;-)
Jo, what you’ve smoked today ;-)))
The fall where touched the floor, calling you dummy,…hehe